"I would have anxiety attacks. I'd get hot flashes, feel like I was about to pass up or throw up. It would happen a lot before shows, and I'd have to cancel. Then the anxiety started coming from anxiety.

"You get in this hole that seems like you're never going to be able to get out of."

Miley is Marie Claire's September cover star

Nowadays, when she’s not in the studio, Miley also works with the Happy Hippie Foundation, a charity she set up to help youth homelessness, and she's previously opened up on the topic, revealing that she considers herself the perfect person to highlight the issue.

“I’m the one that can fix it,” she said. “I think I’ve been able to identify with it just because I’ve never thought of myself as, ‘I’m a girl and so I can’t do this, or I can do this, or you’ve got to be a boy to do that.’ I feel completely like I’m not tied to a gender or to an age. I feel like an infinite cosmic thing, and that’s what I want people to feel.”